Newton levelled from close range on the hour mark, but substitute Lawrence won the game for Man United in the 66th minute.
Connor Newton: “It’s great to get on the scoresheet, as I don’t do it very often.
“I suppose it is one I will always remember against Manchester United in front of the MUTV cameras, with people around the world watching in.
“The lads are a bit gutted, but we just have to get on with it.
“We need to work on our defending – that’s two sloppy goals.”
NEWCASTLE UNITED: Alnwick; Newton, Tavernier, Satka, Moyo; Hooper, Amalfitano (Knight, 42), Inman, Abeid, Maddison (Kitchen, 85); Xisco (Riley, 55).